Imaging lens system

ABSTRACT

An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed at intervals from an object side of the imaging lens system. The imaging lens system satisfies 1.5&lt;Nd5&lt;1.6, 30&lt;V5&lt;50, and TTL/2IH&lt;0.730, where Nd5 is a refractive index of the fifth lens, V5 is an Abbe number of the fifth lens, TTL is a distance from an object side surface of the first lens to an imaging plane, and 2IH is a diagonal length of the imaging plane.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority and benefit under 35 USC 119(a) ofKorean Patent Application No. 10-2019-0071406, filed on Jun. 17, 2019with the Korean Intellectual Property Office, the entire disclosure ofwhich is incorporated herein by reference for all purposes.

BACKGROUND

The following description relates to an imaging lens system includingseven lenses.

A compact camera may be mounted on a wireless terminal. For example, thecompact camera may be mounted on a front surface and a rear surfacethereof, respectively. Such a compact camera is used for a variety ofpurposes such as outdoor scenery photography, indoor portraitphotography and the like, such that performance that is not inferior toa general camera is required. However, it is difficult to realize highperformance because a small camera is limited by a mounting space due toa size of a wireless terminal. Therefore, it is necessary to develop animaging lens system capable of improving the performance of a compactcamera without increasing the size of the compact camera.

SUMMARY

This Summary is provided to introduce a selection of concepts insimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

In one general aspect, an imaging lens system includes a first lens, asecond lens, a third lens, a fourth lens, a fifth lens, a sixth lens,and a seventh lens, sequentially disposed at intervals from an objectside of the imaging lens system. The imaging lens system satisfies1.5<Nd5<1.6, 30<V5<50, and TTL/2IH<0.730, where Nd5 is a refractiveindex of the fifth lens, V5 is an Abbe number of the fifth lens, TTL isa distance from an object side surface of the first lens to an imagingplane, and 2IH is a diagonal length of the imaging plane.

The imaging lens system may satisfy 10<V1−V3<10, where V1 is an Abbenumber of the first lens and V3 is an Abbe number of the third lens.

The imaging lens system may satisfy 25<V1−V4<45, where V1 is an Abbenumber of the first lens and V4 is an Abbe number of the fourth lens.

The imaging lens system may satisfy 0<V1−V5<20, where V1 is an Abbenumber of the first lens.

A refractive index of the fourth lens may be greater than 1.6.

The imaging lens system may satisfy 1.5<f3/f, where f is a focal lengthof the imaging lens system and f3 is a focal length of the third lens.

The fourth lens may have negative refractive power.

The fifth lens may have a convex shape on an object side surface.

The imaging lens system may have an F-number of 2.0 or less.

In another general aspect, an imaging lens system includes a first lens,a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens,and a seventh lens, sequentially disposed at intervals from an objectside of the imaging lens system. An object side surface of the fourthlens or an object side surface of the fifth lens is concave, and anF-number is 2.0 or less. The imaging lens system satisfies TTL/2IH<0.73,where TTL is a distance from an object side surface of the first lens toan imaging plane and 2IH is a diagonal length of the imaging plane.

The third lens may have positive refractive power.

The fifth lens may have a concave shape on an image side surface.

The seventh lens may have a concave shape on an object side surface.

A refractive index of the fifth lens may be greater than 1.5 and lessthan 1.6.

The imaging lens system may satisfy −10<V1−V3<10, where V1 is an Abbenumber of the first lens and V3 is an Abbe number of the third lens.

The imaging lens system may satisfy 0<V1−V5<20, where V5 is an Abbenumber of the fifth lens.

A refractive power of the first lens may be greater than a refractivepower of the third lens, and a refractive power of the sixth lens may begreater than the refractive power of the third lens.

The first lens may have positive refractive power, the second lens mayhave negative refractive power, the third lens may have positiverefractive power, the fourth lens may have negative refractive power,the sixth lens may have positive refractive power, and the seventh lensmay have negative refractive power.

Other features and aspects will be apparent from the following detaileddescription, the drawings, and the claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a configuration diagram of an imaging lens system according toa first example.

FIG. 2 illustrates aberration curves of the imaging lens systemillustrated in FIG. 1.

FIG. 3 is a configuration diagram of an imaging lens system according toa second example.

FIG. 4 illustrates aberration curves of the imaging lens systemillustrated in FIG. 3.

FIG. 5 is a configuration diagram of an imaging lens system according toa third example.

FIG. 6 illustrates aberration curves of the imaging lens systemillustrated in FIG. 5.

FIG. 7 is a configuration diagram of an imaging lens system according toa fourth example.

FIG. 8 illustrates aberration curves of the imaging lens systemillustrated in FIG. 7.

FIG. 9 is a configuration diagram of an imaging lens system according toa fifth example.

FIG. 10 illustrates aberration curves of the imaging lens systemillustrated in FIG. 9.

FIG. 11 is a configuration diagram of an imaging lens system accordingto a sixth example.

FIG. 12 illustrates aberration curves of the imaging lens systemillustrated in FIG. 11.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent to one of ordinary skill inthe art. The sequences of operations described herein are merelyexamples, and are not limited to those set forth herein, but may bechanged as will be apparent to one of ordinary skill in the art, withthe exception of operations necessarily occurring in a certain order.Also, descriptions of functions and constructions that would be wellknown to one of ordinary skill in the art may be omitted for increasedclarity and conciseness.

The features described herein may be embodied in different forms, andare not to be construed as being limited to the examples describedherein. Rather, the examples described herein have been provided so thatthis disclosure will be thorough and complete, and will fully convey thescope of the disclosure to one of ordinary skill in the art.

Herein, it is noted that use of the term “may” with respect to anexample or embodiment, e.g., as to what an example or embodiment mayinclude or implement, means that at least one example or embodimentexists in which such a feature is included or implemented while allexamples and embodiments are not limited thereto.

Throughout the specification, when an element, such as a layer, region,or substrate, is described as being “on,” “connected to,” or “coupledto” another element, it may be directly “on,” “connected to,” or“coupled to” the other element, or there may be one or more otherelements intervening therebetween. In contrast, when an element isdescribed as being “directly on,” “directly connected to,” or “directlycoupled to” another element, there can be no other elements interveningtherebetween.

As used herein, the term “and/or” includes any one and any combinationof any two or more of the associated listed items.

Although terms such as “first,” “second,” and “third” may be used hereinto describe various members, components, regions, layers, or sections,these members, components, regions, layers, or sections are not to belimited by these terms. Rather, these terms are only used to distinguishone member, component, region, layer, or section from another member,component, region, layer, or section. Thus, a first member, component,region, layer, or section referred to in examples described herein mayalso be referred to as a second member, component, region, layer, orsection without departing from the teachings of the examples.

Spatially relative terms such as “above,” “upper,” “below,” and “lower”may be used herein for ease of description to describe one element'srelationship to another element as shown in the figures. Such spatiallyrelative terms are intended to encompass different orientations of thedevice in use or operation in addition to the orientation depicted inthe figures. For example, if the device in the figures is turned over,an element described as being “above” or “upper” relative to anotherelement will then be “below” or “lower” relative to the other element.Thus, the term “above” encompasses both the above and below orientationsdepending on the spatial orientation of the device. The device may alsobe oriented in other ways (for example, rotated 90 degrees or at otherorientations), and the spatially relative terms used herein are to beinterpreted accordingly.

The terminology used herein is for describing various examples only, andis not to be used to limit the disclosure. The articles “a,” “an,” and“the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. The terms “comprises,” “includes,”and “has” specify the presence of stated features, numbers, operations,members, elements, and/or combinations thereof, but do not preclude thepresence or addition of one or more other features, numbers, operations,members, elements, and/or combinations thereof.

Due to manufacturing techniques and/or tolerances, variations of theshapes shown in the drawings may occur. Thus, the examples describedherein are not limited to the specific shapes shown in the drawings, butinclude changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in variousways as will be apparent after an understanding of the disclosure ofthis application. Further, although the examples described herein have avariety of configurations, other configurations are possible as will beapparent after an understanding of the disclosure of this application.

Herein, a first lens means a lens closest to an object (or a subject),and a seventh lens means a lens closest to an imaging surface (or animage sensor). Herein, a unit of a curvature of radius, a thickness, TTL(a distance from an object side surface of the first lens to an imagingsurface), 2IH (a diagonal length of the imaging surface), IH (½ of 2HI),and a focal length of the lens may be in millimeters (mm).

The thickness of the lens, the distance between the lenses, and the TTLare a distance from an optical axis of the lens. In an explanation of ashape of each lens, a convex shape of one surface may mean that aparaxial region of the surface may be convex, and a concave shape of onesurface may mean that a paraxial region of the surface may be concave.Therefore, even when one surface of the lens is described as having aconvex shape, an edge portion of the lens may be concave. Similarly,even when one surface of the lens is described as having a concaveshape, an edge portion of the lens may be convex.

The imaging lens system includes seven lenses. For example, the imaginglens system may include a first lens, a second lens, a third lens, afourth lens, a fifth lens, a sixth lens, and a seventh lens,sequentially disposed from an object side. The first to the seventhlenses are disposed with a predetermined interval betweensuccessive/adjacent lenses. For example, each lens does not contact animage side surface and an object side surface of a neighboring lens inthe paraxial region. An F-number of the imaging lens system may be 2.0or less.

The first lens has refractive power. For example, the first lens haspositive refractive power. The first lens has a convex shape on onesurface. For example, the first lens has a convex shape on an objectside surface.

The first lens includes an aspherical surface. For example, bothsurfaces of the first lens may be aspherical. The first lens may be madeof a material having high light transmittance and excellentworkablility. For example, the first lens may be made of a plasticmaterial. The first lens has a low refractive index. For example, therefractive index of the first lens may be less than 1.6.

The second lens has refractive power. For example, the second lens mayhave negative refractive power. The second lens has a convex shape onone surface. For example, the second lens may have a convex shape on anobject side surface.

The second lens includes an aspherical surface. For example, bothsurfaces of the second lens may be aspherical. The second lens may bemade of a material having high light transmittance and excellentworkability. For example, the second lens may be made of a plasticmaterial. However, the material of the second lens is not limited toplastic. For example, the second lens may be made of a plastic material.The second lens has a refractive index greater than the refractive indexof the first lens. For example, the refractive index of the second lensmay be 1.6 or greater. In addition, a lower limit value of therefractive index of the second lens may be further increased. Forexample, the refractive index of the second lens may be 1.67 or greater.

The third lens has refractive power. For example, the third lens haspositive refractive power. At least one surface of the third lens mayhave a convex shape. For example, the third lens may have a convex shapeon an object side surface.

The third lens includes an aspherical surface. For example, bothsurfaces of the third lens may be aspherical. The third lens may be madeof a material having high light transmittance and excellent workability.For example, the third lens may be made of a plastic material. The thirdlens has a refractive index substantially similar to the refractiveindex of the first lens. For example, the refractive index of the thirdlens may be less than 1.6.

The fourth lens has refractive power. For example, the fourth lens hasnegative refractive power. The fourth lens has a concave shape on onesurface. For example, the fourth lens may have a concave shape on anobject side surface.

The fourth lens includes an aspherical surface. For example, bothsurfaces of the fourth lens may be aspherical. The fourth lens may bemade of a material having high light transmittance and excellentworkability. For example, the fourth lens may be made of a plasticmaterial. The fourth lens has a refractive index greater than therefractive index of the first lens. For example, the refractive index ofthe fourth lens may be 1.6 or greater.

The fifth lens has refractive power. For example, the fifth lens mayhave positive or negative refractive power. The fifth lens has a convexshape on one surface. For example, the fifth lens may have a convexshape on an object side surface. The fifth lens may have a shape havingan inflection point. For example, an inflection point may be formed onat least one surface of the object side surface and an image sidesurface of the fifth lens.

The fifth lens includes an aspherical surface. For example, bothsurfaces of the fifth lens may be aspherical. The fifth lens may be madeof a material having high light transmittance and excellent workability.For example, the fifth lens may be made of a plastic material. The fifthlens may have a refractive index substantially similar to the refractiveindex of the first lens. For example, the refractive index of the fifthlens may be less than 1.6. As another example, the refractive index ofthe fifth lens may be greater than 1.5 and smaller than 1.6. An Abbenumber of the fifth lens may be greater than 30 and less than 50.

The sixth lens has refractive power. For example, the sixth lens haspositive refractive power. The sixth lens has a convex shape on onesurface. For example, the sixth lens may have a convex shape on anobject side surface. The sixth lens may have a shape having aninflection point. For example, an inflection point may be formed on atleast one surface of the object side surface and the image side surfaceof the sixth lens.

The sixth lens includes an aspherical surface. For example, bothsurfaces of the sixth lens may be aspherical. The sixth lens may be madeof a material having high light transmittance and excellent workability.For example, the sixth lens may be made of a plastic material. The sixthlens has a refractive index substantially similar to the refractiveindex of the fifth lens. For example, the refractive index of the sixthlens may be less than 1.6.

The seventh lens has refractive power. For example, the seventh lens hasnegative refractive power. The seventh lens may have a concave shape onat least one surface. For example, the seventh lens may have a concaveshape on an object side surface. The seventh lens may have a shapehaving an inflection point. For example, one or more inflection pointsmay be formed on at least one surface of the object side surface and theimage side surface of the seventh lens.

The seventh lens includes an aspherical surface. For example, bothsurfaces of the seventh lens may be aspherical. The seventh lens may bemade of a material having high light transmittance and excellentworkability. For example, the seventh lens may be made of a plasticmaterial. The seventh lens may have a refractive index substantiallysimilar to the refractive index of the sixth lens. For example, therefractive index of the seventh lens may be less than 0.6.

The first to seventh lenses include aspherical surfaces as describedabove. The aspherical surfaces of the first to seventh lenses may berepresented by the following Equation

$\begin{matrix}{Z = {\frac{cr^{2}}{1 + \sqrt{1 - {\left( {1 + k} \right)c^{2}r^{2}}}} + {Ar^{4}} + {Br^{6}} + {Cr^{8}} + {Dr^{10}} + {Er^{12}} + {Fr}^{14} + {Gr^{16}} + {Hr^{18}} + {Jr^{20}}}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

In Equation 1, c is a reciprocal of a radius of curvature of the lens, kis a conic constant, r is a distance from any point on an asphericalsurface to an optical axis, A through J are aspherical surfaceconstants, and Z (or SAG) is a height in an optical axis direction fromany point on an aspheric surface to an apex of the aspheric surface.

The imaging lens system further includes a filter, an image sensor, anda stop.

The filter is disposed between the seventh lens and the image sensor.The filter may block some wavelengths of light. For example, the filtermay block infrared light wavelengths. The image sensor forms an imagingplane on which light refracted through the first lens to the seventhlens may be formed. The image sensor converts an optical signal into anelectrical signal. For example, the image sensor may convert an opticalsignal incident on the imaging plane into an electrical signal. The stopis disposed to adjust an amount of light incident on the lens. Forexample, the stop may be disposed between the first lens and the secondlens or disposed between the second lens and the third lens.

The imaging lens system may satisfy at least one of the followingconditional expressions.

0<f1/f<2.0  Conditional Expression 1

25<V1−V2<45  Conditional Expression 2

−10<V1−V3<10  Conditional Expression 3

25<V1−V4<45  Conditional Expression 4

0<V1−V5<20  Conditional Expression 5

−3.5<f2/f<0  Conditional Expression 6

1.5<f3/f  Conditional Expression 7

f4/f<0  Conditional Expression 8

f5/f<0  Conditional Expression 9

0<f6/f  Conditional Expression 10

f7/f<0  Conditional Expression 11

TTL/f<1.4  Conditional Expression 12

−1.0<f1/f2<0  Conditional Expression 13

−2.0<f2/f3<0  Conditional Expression 14

BFL/f<0.4  Conditional Expression 15

D12/f<0.1  Conditional Expression 16

SD5/IH<0.6  Conditional Expression 17

0.7<SD6/IH  Conditional Expression 18

0.8<SD7/IH  Conditional Expression 19

TTL/2IH<0.730  Conditional Expression 20

30<V5<50  Conditional Expression 21

In the imaging lens system, the refractive power of the first lens isgreater than the refractive power of the third lens, and the refractivepower of the sixth lens is greater than the refractive power of thethird lens. For example, the first lens, the third lens, and the sixthlens may satisfy all of the following conditional expressions.

1/f3<1/f1  Conditional Expression 22

1/f3<1/f6  Conditional Expression 23

In the conditional expressions, f is a focal length of the imaging lenssystem, f1 is a focal length of the first lens, f2 is a focal length ofthe second lens, f3 is a focal length of the third lens, f4 is a focallength of the fourth lens, f5 is a focal length of the fifth lens, f6 isa focal length of the sixth lens, and f7 is a focal length of theseventh lens, V1 is an Abbe number of the first lens, V2 is an Abbenumber of the second lens, V3 is an Abbe number of the third lens, V4 isan Abbe number of the fourth lens, and V5 is an Abbe number of the fifthlens, TTL is a distance from an object side surface of the first lens toan imaging plane, BFL is a distance from an image side surface of theseventh lens to an imaging plane, D12 is a distance from the image sidesurface of the first lens to an object side surface of the second lens,SD5 is an effective radius of the fifth lens, SD6 is an effective radiusof the sixth lens, and 2IH is a diagonal length of the imaging plane.

Conditional expression 1 is a condition for limiting appropriaterefractive power of the first lens. The first lens that is outside of anumerical range of the conditional expression increases a focal lengthof the imaging lens system, making miniaturization of the imaging lenssystem difficult. Conditional expressions 2 to 5 are conditions forreducing chromatic aberrations of the imaging lens system. Conditionalexpressions 6 to 11 are conditions for limiting appropriate refractivepower of the second lens to the seventh lens, respectively. A lens thatis outside of the numerical range of the conditional expressions is toohigh or too low to correct aberrations through each lens. Conditionalexpressions 12 and 15 are conditions for miniaturization of the imaginglens system. The imaging lens system that is outside of the upper limitvalue of the conditional expression is not suitable for a portableterminal because the distance from the object side surface of the firstlens to the imaging plane is outside of the range that can be mounted onthe portable terminal or the focal length of the imaging lens system istoo short. Conditional expressions 13 and 14 are conditions for limitingan appropriate focal length of the first lens to the third lens. A lensthat is outside of the numerical value of the conditional expression maycause aberration characteristics to deteriorate because the refractivepower thereof may be too high. Conditional expression 16 is a conditionfor reducing chromatic aberrations through the first lens and the secondlens. For example, if a distance between the first lens and the secondlens is outside of the upper limit value of the conditional expression,it is difficult to improve the chromatic aberrations according to Abbenumber deviation of the first lens and the second lens. Conditionalexpressions 17 to 19 are conditions for reducing a flare phenomenon. Ifeffective radii of the fifth lens to the seventh lens are outside of theupper limit value or the lower limit value of the conditionalexpression, a sweep angle of each lens becomes wider, such that flarecharacteristics may be deteriorated.

An imaging lens system according to a first example will be describedwith reference to FIG. 1.

An imaging lens system 100 includes a first lens 110, a second lens 120,a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160,and a seventh lens 170.

The first lens 110 has positive refractive power, and the first lens 110has a convex shape on an object side surface and a concave shape on animage side surface. The second lens 120 has negative refractive power,and the second lens 120 has a convex shape on an object side surface anda concave shape on an image side surface. The third lens 130 haspositive refractive power, and the third lens 130 has a convex shape onan object side surface and a convex shape on an image side surface. Thefourth lens 140 has negative refractive power, and the fourth lens 140has a concave shape on an object side surface and a concave shape on animage side surface. The fifth lens 150 has negative refractive power,and the fifth lens 150 has a convex shape on an object side surface anda concave shape on an image side surface. Further, the fifth lens 150has a shape in which an inflection point is formed on the object sidesurface and the image side surface. The sixth lens 160 has positiverefractive power, and the sixth lens 160 has a convex shape on an objectside surface and a convex shape on an image side surface. Further, thesixth lens 160 has a shape in which an inflection point is formed on theobject side surface and the image side surface. The seventh lens 170 hasnegative refractive power, and the seventh lens 170 has a concave shapeon an object side surface and a concave shape on an image side surface.Further, the seventh lens 170 has a shape in which an inflection pointis formed on the object side surface and the image side surface.

The imaging lens system 100 further includes a filter 180 and an imagesensor 190. The filter 180 is disposed between the seventh lens 170 andthe image sensor 190. For reference, although not shown in the drawings,a stop may be disposed between the second lens 120 and the third lens130.

The imaging lens system 100, configured as described above, illustratesaberration characteristics as shown in FIG. 2. Tables 1 and 2 illustratelens characteristics and aspherical surface values of the imaging lenssystem 100.

TABLE 1 Surface Radius of Thickness/ Refractive Abbe number Referencecurvature distance index number S1 First lens 2.31 0.912 1.544 56.1 S210.53 0.164 S3 Second lens 6.94 0.234 1.671 19.3 S4 3.85 0.422 S5 Thirdlens 29.14 0.398 1.544 56.1 S6 −24.16 0.264 S7 Fourth lens −15.48 0.3841.661 20.4 S8 60.01 0.421 S9 Fifth lens 6.03 0.391 1.568 37.4 S10 5.660.341 S11 Sixth lens 3.16 0.721 1.544 56.1 S12 −6.06 0.608 S13 Seventhlens −4.75 0.400 1.544 56.1 S14 2.67 0.305 S15 Filter Infinity 0.2101.514 64.1 S16 Infinity 0.505 Imaging Imaging Infinity 0.015 Plane Plane

TABLE 2 Ex. 1 K A B C D E F G H J S1 −1.0366 0.0116 −0.0008 0.0048−0.0062 0.0047 −0.0020 0.0005 −4.53E−05  0 S2 23.6958 −0.0234 0.0212−0.0193 0.0153 −0.0096 0.0038 −0.0008 0.0001 0 S3 14.9297 −0.0630 0.0570−0.0346 0.0148 −0.0034 −0.0002 0.0004 −0.0001   0 S4 0.1548 −0.04900.0678 −0.0816 0.1019 −0.0934 0.0551 −0.0183 0.0027 0 S5 0 −0.04230.0589 −0.1884 0.3228 −0.3302 0.1974 −0.0637 0.0086 0 S6 1.2398 −0.04050.0131 −0.0336 0.0382 −0.0292 0.0134 −0.0031 0.0003 0 S7 0.00E+00−0.0791 0.0820 −0.1699 0.2105 −0.1653 0.0785 −0.0206 0.0023 0 S80.00E+00 −0.0733 0.0632 −0.0860 0.0773 −0.0452 0.0163 −0.0033 0.0003 0S9 0.00E+00 −0.1024 0.0794 −0.0551 0.0259 −0.0082 0.0017 −0.00021.10E−05 0 S10 −64.3279 −0.1135 0.0639 −0.0370 0.0160 −0.0045 0.0008−0.0001 3.26E−06 0 S11 −6.4594 −0.0209 0.0062 −0.0036 0.0001 0.0002−4.09E−05   3.12E−06 −8.70E−08  0 S12 −96.2611 0.0152 0.0068 −0.00730.0021 −0.0003 2.36E−05 −9.62E−07 1.55E−08 0 S13 −8.2127 −0.0827 0.0327−0.0059 0.0006 −3.90E−05 1.43E−06 −2.71E−08 1.86E−10 0 S14 −13.2198−0.0455 0.0159 −0.0036 0.0005 −4.84E−05 2.91E−06 −1.07E−07 2.19E−09 0

An imaging lens system according to a second example will be describedwith reference to FIG. 3.

An imaging lens system 200 includes a first lens 210, a second lens 220,a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260,and a seventh lens 270.

The first lens 210 has positive refractive power, and the first lens 210has a convex shape on an object side surface and a concave shape on animage side surface. The second lens 220 has negative refractive power,and the second lens 220 has a convex shape on an object side surface anda concave shape on an image side surface. The third lens 230 haspositive refractive power, and the third lens 230 has a convex shape onan object side surface and a convex shape on an image side surface. Thefourth lens 240 has negative refractive power, and the fourth lens 240has a concave shape on an object side surface and a concave shape on animage side surface. The fifth lens 250 has negative refractive power,and the fifth lens 250 has a convex shape on an object side surface anda concave shape on an image side surface. Further, the fifth lens 250has a shape in which an inflection point is formed on the object sidesurface and the image side surface. The sixth lens 260 has positiverefractive power, and the sixth lens 260 has a convex shape on an objectside surface and a convex shape on an image side surface. Further, thesixth lens 260 has a shape in which an inflection point is formed on theobject side surface and the image side surface. The seventh lens 270 hasnegative refractive power, and the seventh lens 270 has a concave shapeon an object side surface and a concave shape on an image side surface.Further, the seventh lens 270 has a shape in which an inflection pointis formed on the object side surface and the image side surface.

The imaging lens system 200 further includes a filter 280 and an imagesensor 290. The filter 280 is disposed between the seventh lens 270 andthe image sensor 290. For reference, although not shown in the drawings,a stop may be disposed between the second lens 220 and the third lens230.

The imaging lens system 200 illustrates aberration characteristics asshown in FIG. 4. Tables 3 and 4 illustrate lens characteristics andaspherical surface values of the imaging lens system 200.

TABLE 3 Surface Radius of Thickness/ Refractive Abbe number Referencecurvature distance index number S1 First lens 2.31 0.902 1.544 56.1 S210.41 0.165 S3 Second lens 6.90 0.230 1.671 19.3 S4 3.85 0.425 S5 Thirdlens 29.98 0.400 1.544 56.1 S6 −22.77 0.254 S7 Fourth lens −14.79 0.3811.661 20.4 S8 76.35 0.433 S9 Fifth lens 5.97 0.385 1.568 37.4 S10 5.620.350 S11 Sixth lens 3.16 0.724 1.544 56.1 S12 −6.24 0.611 S13 Seventhlens −4.77 0.404 1.544 56.1 S14 2.67 0.305 S15 Filter Infinity 0.2101.514 64.1 S16 Infinity 0.506 Imaging Imaging Infinity 0.015 plane plane

TABLE 4 Ex. 2 K A B C D E F G H J S1 −1.0458 0.0110 0.0016 0.0001−0.0010   0.0013 −0.0008 0.0002 −2.34E−05  −1.89E−11 S2 23.3325 −0.02370.0220 −0.0210 0.0169 −0.0102 0.0039 −0.0008 0.0001 −1.89E−11 S3 14.9068−0.0626 0.0550 −0.0321 0.0139 −0.0039 0.0005   0.0001 −4.75E−05 −1.89E−11 S4 0.1571 −0.0490 0.0681 −0.0849 0.1100 −0.1027 0.0608 −0.02010.0029 −1.89E−11 S5 0 −0.0435 0.0688 −0.2161 0.3638 −0.3653 0.2149−0.0683 0.0091 −1.89E−11 S6 13.4162 −0.0370 0.0024 −0.0147 0.0143−0.0093 0.0034 −0.0004 −4.30E−05  −1.89E−11 S7 0 −0.0731 0.0587 −0.12640.1595 −0.1292 0.0637 −0.0174 0.0020 −1.89E−11 S8 0 −0.0725 0.0621−0.0871 0.0798 −0.0473 0.0173 −0.0035 0.0003 −1.89E−11 S9 0 −0.10480.0841 −0.0600 0.0290 −0.0096 0.0021 −0.0003 1.49E−05 −1.89E−11 S10−63.2478 −0.1133 0.0633 −0.0349 0.0141 −0.0038 0.0006 −0.0001 2.56E−06−1.89E−11 S11 −6.5212 −0.0205 0.0060 −0.0035 0.0001   0.0002 −3.94E−05  2.98E−06 −8.24E−08  −1.89E−11 S12 −98.4791 0.0159 0.0055 −0.0065 0.0019−0.0003 2.00E−05 −7.81E−07 1.18E−08 −1.89E−11 S13 −7.8013 −0.0814 0.0318−0.0057 0.0006 −3.69E−05 1.34E−06 −2.46E−08 1.48E−10 −1.89E−11 S14−13.1752 −0.0450 0.0157 −0.0036 0.0005 −0.0001 3.37E−06 −1.37E−073.16E−09 −3.20E−11

An imaging lens system according to a third example will be describedwith reference to FIG. 5.

An imaging lens system 300 includes a first lens 310, a second lens 320,a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360,and a seventh lens 370.

The first lens 310 has positive refractive power, and the first lens 310has a convex shape on an object side surface and a concave shape on animage side surface. The second lens 320 has negative refractive power,and the second lens 320 has a convex shape on an object side surface anda concave shape on an image side surface. The third lens 330 haspositive refractive power, and the third lens 330 has a convex shape onan object side surface and a concave shape on an image side surface. Thefourth lens 340 has negative refractive power, and the fourth lens 340has a concave shape on an object side surface and a concave shape on animage side surface. The fifth lens 350 has positive refractive power,and the fifth lens 350 has a convex shape on an object side surface anda concave shape on an image side surface. Further, the fifth lens 350has a shape in which an inflection point is formed on the object sidesurface and the image side surface. The sixth lens 360 has positiverefractive power, and the sixth lens 360 has a convex shape on an objectside surface and a convex shape on an image side surface. Further, thesixth lens 360 has a shape in which an inflection point is formed on theobject side surface and the image side surface. The seventh lens 370 hasnegative refractive power, and the seventh lens 370 has a concave shapeon an object side surface and a concave shape on an image side surface.Further, the seventh lens 370 has a shape in which an inflection pointis formed on the object side surface and the image side surface.

The imaging lens system 300 further includes a filter 380 and an imagesensor 390. The filter 380 is disposed between the seventh lens 370 andthe image sensor 390. For reference, although not shown in the drawings,a stop may be disposed between the second lens 320 and the third lens330.

The imaging lens system 300 illustrates aberration characteristics asshown in FIG. 6. Tables 5 and 6 illustrate lens characteristics andaspherical surface values of the imaging lens system 300.

TABLE 5 Surface Radius of Thickness/ Refractive Abbe number Referencecurvature distance index number S1 First lens 2.31 0.872 1.544 56.1 S29.70 0.188 S3 Second lens 6.75 0.230 1.671 19.3 S4 3.80 0.489 S5 Thirdlens 16.19 0.385 1.544 56.1 S6 167.06 0.300 S7 Fourth lens −23.80 0.3051.661 20.4 S8 40.38 0.366 S9 Fifth lens 5.35 0.370 1.568 37.4 S10 5.320.395 S11 Sixth lens 3.24 0.686 1.544 56.1 S12 −6.56 0.717 S13 Seventhlens −3.58 0.400 1.544 56.1 S14 3.42 0.305 S15 Filter Infinity 0.2101.514 64.1 S16 Infinity 0.467 Imaging Imaging Infinity 0.015 plane plane

TABLE 6 Ex. 3 K A B C D E F G H J S1 −1.1399 0.0126 −0.0026 0.0080−0.0100 0.0073 −0.0031 0.0007 −0.0001   0 S2 17.5707 −0.0266 0.0136−0.0013 −0.0051 0.0039 −0.0014 0.0002 −1.65E−05 0 S3 13.9756 −0.06930.0468 0.0053 −0.0362 0.0329 −0.0152 0.0037 −0.0004   0 S4 0.8385−0.0479 0.0299 0.0494 −0.1079 0.1034 −0.0542 0.0149 −0.0016   0 S5 0−0.0461 0.0540 −0.1587 0.2603 −0.2573 0.1493 −0.0469 0.0062 0 S6 −7.5340−0.0448 0.0274 −0.0781 0.1061 −0.0865 0.0412 −0.0104 0.0011 0 S7 0−0.0764 0.0778 −0.1673 0.1988 −0.1446 0.0632 −0.0151 0.0015 0 S8 0−0.0847 0.0920 −0.1359 0.1217 −0.0680 0.0232 −0.0044 0.0004 0 S9 0−0.1262 0.1233 −0.0966 0.0501 −0.0176 0.0040 −0.0005  3.07E−05 0 S10−54.7889 −0.1208 0.0816 −0.0462 0.0181 −0.0049 0.0009 −0.0001  4.45E−060 S11 −8.7794 −0.0128 −0.0022 0.0010 −0.0010 0.0004 −0.0001 4.45E−06−1.33E−07 0 S12 −40.2521 0.0295 −0.0189 0.0049 −0.0009 0.0002 −1.76E−051.16E−06 −3.12E−08 0 S13 −3.6141 −0.0550 0.0087 0.0019 −0.0007 0.0001−6.62E−06 2.36E−07 −3.47E−09 0 S14 −15.7838 −0.0378 0.0096 −0.00130.0001 −1.72E−06 −1.76E−07 1.40E−08 −4.05E−10 4.26E−12

An imaging lens system according to a fourth example will be describedwith reference to FIG. 7.

An imaging lens system 400 includes a first lens 410, a second lens 420,a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460,and a seventh lens 470.

The first lens 410 has positive refractive power, and the first lens 410has a convex shape on an object side surface and a concave shape on animage side surface. The second lens 420 has negative refractive power,and the second lens 420 has a convex shape on an object side surface anda concave shape on an image side surface. The third lens 430 haspositive refractive power, and the third lens 430 has a convex shape onan object side surface and a concave shape on an image side surface. Thefourth lens 440 has negative refractive power, and the fourth lens 440has a concave shape on an object side surface and a concave shape on animage side surface. The fifth lens 450 has negative refractive power,and the fifth lens 450 has a convex shape on an object side surface anda concave shape on an image side surface. Further, the fifth lens 450has a shape in which an inflection point is formed on the object sidesurface and the image side surface. The sixth lens 460 has positiverefractive power, and the sixth lens 460 has a convex shape on an objectside surface and a concave shape on an image side surface. Further, thesixth lens 460 has a shape in which an inflection point is formed on theobject side surface and the image side surface. The seventh lens 470 hasnegative refractive power, and the seventh lens 470 has a concave shapeon an object side surface and a concave shape on an image side surface.Further, the seventh lens 470 has a shape in which an inflection pointis formed on the object side surface and the image side surface.

The imaging lens system 400 further includes a filter 480 and an imagesensor 490. The filter 480 is disposed between the seventh lens 470 andthe image sensor 490. For reference, although not shown in the drawings,a stop may be disposed between the second lens 420 and the third lens430.

The imaging lens system 400 illustrates aberration characteristics asshown in FIG. 8. Tables 7 and 8 illustrate lens characteristics andaspherical surface values of the imaging lens system 400.

TABLE 7 Surface Radius of Thickness/ Refractive Abbe number Referencecurvature distance index number S1 First lens 2.723 1.100 1.544 56.1 S212.203 0.181 S3 Second lens 8.384 0.230 1.671 19.3 S4 4.498 0.529 S5Third lens 83.525 0.424 1.544 56.1 S6 −31.911 0.232 S7 Fourth lens−40.873 0.408 1.661 20.4 S8 497.247 0.678 S9 Fifth lens 6.912 0.3731.568 37.4 S10 5.807 0.443 S11 Sixth lens 2.544 0.541 1.544 56.1 S126.584 1.354 S13 Seventh lens −4.071 0.420 1.544 56.1 S14 7.701 0.377 S15Filter Infinity 0.210 1.514 64.2 S16 Infinity 0.345 Imaging ImagingInfinity −0.015 plane plane

TABLE 8 Ex. 4 K A B C D E F G H J S1 −1.0394 0.0040 0.0069 −0.00840.0069 −0.0036 0.0012 −0.0003  3.23E−05 −1.74E−06  S2 21.6009 −0.01710.0046 0.0082 −0.0127 0.0089 −0.0037     0.0009 −0.0001 7.09E−06 S315.9987 −0.0525 0.0325 0.0037 −0.0232 0.0211 −0.0103     0.0030 −0.00053.06E−05 S4 1.0581 −0.0412 0.0340 −0.0111 0.0039 −0.0057 0.0059 −0.0029  0.0007 −0.0001 S5 0 −0.0210 −0.0180 0.0475 −0.0705 0.0651 −0.0374    0.0129 −0.0025   0.0002 S6 −76.4723 −0.0373 0.0235 −0.0503 0.0666−0.0527 0.0260 −0.0079   0.0013 −0.0001 S7 0 −0.0410 0.0064 −0.00810.0068 −0.0022 −0.0003     0.0004 −0.0001 1.26E−05 S8 0 −0.0354 0.0130−0.0145 0.0106 −0.0045 0.0011 −0.0001 −7.15E−06 1.59E−06 S9 0 −0.06250.0399 −0.0218 0.0081 −0.0022 0.0004 −0.0001   0.0000 −1.37E−07  S10−99.0000 −0.0603 0.0241 −0.0076 0.0016 −0.0002  2.98E−05 −3.23E−06  2.10E−07 −5.68E−09  S11 −7.2394 0.0102 −0.0102 0.0021 −0.0004 0.0001−5.72E−06 3.13E−07 −9.05E−09 1.08E−10 S12 −27.2182 0.0362 −0.0182 0.0039−0.0006 0.0001 −4.38E−06 2.05E−07 −5.44E−09 6.16E−11 S13 −4.2405 −0.03380.0065 −0.0004 1.56E−06   1.38E−06 −8.01E−08 1.82E−09 −1.07E−11−1.27E−13  S14 −54.8281 −0.0218 0.0032 −0.0003 1.25E−05 −3.05E−07 1.15E−08 −8.25E−10   2.96E−11 −3.74E−13 

An imaging lens system according to a fifth example will be describedwith reference to FIG. 9.

An imaging lens system 500 includes a first lens 510, a second lens 520,a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560,and a seventh lens 570.

The first lens 510 has positive refractive power, and the first lens 510has a convex shape on an object side surface and a concave shape on animage side surface. The second lens 520 has negative refractive power,and the second lens 520 has a convex shape on an object side surface anda concave shape on an image side surface. The third lens 530 haspositive refractive power, and the third lens 530 has a convex shape onan object side surface and a convex shape on an image side surface. Thefourth lens 540 has negative refractive power, and the fourth lens 540has a concave shape on an object side surface and a concave shape on animage side surface. The fifth lens 550 has negative refractive power,and the fifth lens 550 has a convex shape on an object side surface anda concave shape on an image side surface. Further, the fifth lens 550has a shape in which an inflection point is formed on the object sidesurface and the image side surface. The sixth lens 560 has positiverefractive power, and the sixth lens 560 has a convex shape on an objectside surface and a concave shape on an image side surface. Further, thesixth lens 560 has a shape in which an inflection point is formed on theobject side surface and the image side surface. The seventh lens 570 hasnegative refractive power, and the seventh lens 570 has a concave shapeon an object side surface and a concave shape on an image side surface.Further, the seventh lens 570 has a shape in which an inflection pointis formed on the object side surface and the image side surface.

The imaging lens system 500 further includes a filter 580 and an imagesensor 590. The filter 580 is disposed between the seventh lens 570 andthe image sensor 590. For reference, although not shown in the drawings,a stop may be disposed between the second lens 520 and the third lens530.

The imaging lens system 500 illustrates an aberration characteristic asshown in FIG. 10. Tables 9 and 10 illustrate lens characteristics andaspherical surface values of the imaging lens system 500.

TABLE 9 Surface Radius of Thickness/ Refractive Abbe number Referencecurvature distance index number S1 First lens 2.7185076 1.092 1.544 56.1S2 12.76 0.175 S3 Second lens 8.66 0.230 1.671 19.3 S4 4.58 0.542 S5Third lens 58.30 0.437 1.544 56.1 S6 −37.343513 0.233 S7 Fourth lens−39.38 0.455 1.639 23.5 S8 197.62 0.629 S9 Fifth lens 6.51 0.370 1.56837.4 S10 4.86 0.417 S11 Sixth lens 2.50 0.544 1.544 56.1 S12 7.54 1.368S13 Seventh lens −4.08 0.420 1.544 56.1 S14 7.41 0.377 S15 FilterInfinity 0.210 1.514 64.2 S16 Infinity 0.347 Imaging Imaging Infinity−0.015 plane plane

TABLE 10 Ex. 5 K A B C D E F G H J S1 −1.0355 0.0008 0.0147 −0.01930.0161 −0.0085 0.0029 −0.0006     0.0001 −3.66E−06 S2 23.2430 −0.01910.0100 0.0009 −0.0062 0.0051 −0.0023 0.0006 −0.0001  4.77E−06 S3 16.0208−0.0571 0.0446 −0.0141 −0.0065 0.0106 −0.0060 0.0018 −0.0003  2.02E−05S4 0.9155 −0.0438 0.0385 −0.0132 −0.0020 0.0049 −0.0023 0.0005 −1.72E−05−4.19E−06 S5 0 −0.0212 −0.0159 0.0393 −0.0520 0.0426 −0.0217 0.0067−0.0011 0.0001 S6 −43.9004 −0.0442 0.0384 −0.0699 0.0811 −0.0581 0.0263−0.0074     0.0012 −0.0001   S7 0 −0.0412 0.0034 0.0035 −0.0134 0.0170−0.0110 0.0039 −0.0007 0.0001 S8 0 −0.0371 0.0171 −0.0170 0.0098 −0.00280.0001 0.0002 −4.53E−05  3.78E−06 S9 0 −0.0761 0.0558 −0.0344 0.0147−0.0045 0.0009 −0.0001    9.80E−06 −3.30E−07 S10 −75.9915 −0.0668 0.0292−0.0101 0.0023 −0.0004 0.0001 −4.85E−06   2.85E−07 −7.22E−09 S11 −8.22690.0131 −0.0136 0.0036 −0.0008 0.0001 −1.04E−05 5.57E−07 −1.59E−08 1.90E−10 S12 −38.3867 0.0373 −0.0206 0.0051 −0.0008 0.0001 −7.88E−063.83E−07 −1.03E−08  1.18E−10 S13 −3.1329 −0.0341 0.0063 −0.0004−7.92E−07   1.14E−06 −4.71E−08 1.78E−10  2.87E−11 −5.13E−13 S14 −42.1372−0.0248 0.0041 −0.0004   2.77E−05 −1.22E−06   3.46E−08 −6.33E−10  9.25E−12 −1.06E−13

An imaging lens system according to a sixth example will be describedwith reference to FIG. 11.

An imaging lens system 600 includes a first lens 610, a second lens 620,a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660,and a seventh lens 670.

The first lens 610 has positive refractive power, and the first lens 610has a convex shape on an object side surface and a concave shape on animage side surface. The second lens 620 has negative refractive power,and the second lens 620 has a convex shape on an object side surface anda concave shape on an image side surface. The third lens 630 haspositive refractive power, and the third lens 630 has a convex shape onan object side surface and a convex shape on an image side surface. Thefourth lens 640 has negative refractive power, and the fourth lens 640has a concave shape on an object side surface and a convex shape on animage side surface. The fifth lens 650 has positive refractive power,and the fifth lens 650 has a convex shape on an object side surface anda concave shape on an image side surface. Further, the fifth lens 650has a shape in which an inflection point is formed on the object sidesurface and the image side surface. The sixth lens 660 has positiverefractive power, and the sixth lens 660 has a convex shape on an objectside surface and a concave shape on an image side surface. Further, thesixth lens 660 has a shape in which an inflection point is formed on theobject side surface and the image side surface. The seventh lens 670 hasnegative refractive power, and the seventh lens 670 has a concave shapeon an object side surface and a concave shape on an image side surface.Further, the seventh lens 670 has a shape in which an inflection pointis formed on the object side surface and the image side surface.

The imaging lens system 600 further includes a filter 680 and an imagesensor 690. The filter 680 is disposed between the seventh lens 670 andthe image sensor 690. For reference, although not shown in the drawings,a stop may be disposed between the second lens 620 and the third lens630.

The imaging lens system 600 illustrates aberration characteristics asshown in FIG. 12. Tables 11 and 12 illustrate lens characteristics andaspherical surface values of the imaging lens system 600.

TABLE 11 Surface Radius of Thickness/ Refractive Abbe number Referencecurvature distance index number S1 First lens 2.67 1.031 1.544 56.1 S29.43 0.200 S3 Second lens 6.95 0.230 1.680 18.4 S4 4.29 0.622 S5 Thirdlens 59.38986 0.437 1.544 56.1 S6 −50.84 0.264 S7 Fourth lens −23.500.326 1.680 18.4 S8 −61.66 0.571 S9 Fifth lens 6.42 0.359 1.568 37.4 S106.69 0.493 S11 Sixth lens 3.06 0.552 1.544 56.1 S12 9.80 1.430 S13Seventh lens −3.48 0.403 1.544 56.1 S14 10.26 0.181 S15 Filter Infinity0.210 1.514 64.2 S16 Infinity 0.509 Imaging Imaging Infinity 0.012 planeplane

TABLE 12 Ex. 6 K A B C D E F G H J S1 −1.0111 0.0031 0.0115 −0.01760.0170 −0.0102 0.0038 −0.0009   0.0001 −6.32E−06 S2 14.6338 −0.01810.0087 −0.0053 0.0039 −0.0024 0.0010 −0.0002 3.43E−05 −2.02E−06 S313.0489 −0.0453 0.0301 −0.0165 0.0139 −0.0111 0.0059 −0.0019   0.0003−2.53E−05 S4 2.0700 −0.0302 0.0190 0.0095 −0.0239 0.0234 −0.0137 0.0048−0.0010 0.0001 S5 0 −0.0158 −0.0302 0.0716 −0.1026 0.0914 −0.0512 0.0176−0.0034 0.0003 S6 94.2471 −0.0214 −0.0101 0.0093 −0.0072 0.0054 −0.00310.0011 −0.0002  1.63E−05 S7 0 −0.0167 −0.0437 0.0720 −0.0791 0.0568−0.0259 0.0072 −0.0011 0.0001 S8 0 −0.0186 −0.0236 0.0334 −0.0305 0.0182−0.0069 0.0016 −0.0002  1.17E−05 S9 0 −0.0396 0.0203 −0.0108 0.0041−0.0011 0.0002 −2.52E−05 1.79E−06 −5.46E−08 S10 −55.6301 −0.0479 0.0210−0.0082 0.0024 −0.0005 0.0001 −7.14E−06 3.78E−07 −8.43E−09 S11 −7.34010.0023 −0.0046 0.0004 1.39E−06 −2.88E−06 3.40E−07 −2.51E−08 1.01E−09−1.63E−11 S12 −70.2827 0.0258 −0.0110 0.0019 −0.0002   1.02E−05−2.06E−07   −1.08E−08 7.73E−10 −1.41E−11 S13 −5.4006 −0.0324 0.0065−0.0006 0.0001 −6.11E−06 4.47E−07 −1.95E−08 4.53E−10 −4.35E−12 S14−81.9062 −0.0174 0.0025 −0.0002 1.41E−05 −1.05E−06 7.83E−08 −3.60E−098.34E−11 −7.60E−13

Table 13 illustrates characteristic values of the imaging lens systemaccording to the first example to the sixth example.

TABLE 13 First Second Third Fourth Fifth Sixth Reference Example ExampleExample Example Example Example f 5.4400 5.4400 5.5000 6.7900 6.79006.7700 f1 5.2118 5.2360 5.3400 6.1671 6.0930 6.4870 f2 −13.136 −13.269−13.240 −14.973 −14.655 −16.875 f3 24.259 23.771 32.805 42.349 41.76350.247 f4 −18.415 −18.540 −22.408 −56.614 −50.900 −55.460 f5 −264.430−276.040 469.354 −72.648 −36.671 189.158 f6 3.9103 3.9450 4.0730 7.25206.5810 7.9250 f7 −3.0703 −3.0755 −3.1397 −4.8170 −4.7618 −4.7070 f127.4920 7.5199 7.7610 9.1670 4.8690 9.2468 TTL 6.6945 6.7000 6.70007.8300 7.8300 7.8298 BFL 1.0349 1.0360 0.9966 0.9175 0.9188 0.9120 FOV80.0 80.0 80.0 82.0 82.0 82.0 IH 4.6500 4.6500 4.6500 6.0070 6.00706.0070 SD5 2.2950 2.2961 2.2430 3.0737 3.0639 2.9890 SD6 3.3180 3.31763.1810 4.2745 4.1594 4.2990 SD7 4.1960 4.2461 4.1426 5.0657 4.99405.1200

The imaging lens system according to the examples may generally haveoptical characteristics as follows. For example, a total length TTL ofthe imaging lens system is in a range of 5.7 to 8.8 mm, a total focallength is in a range of 4.8 to 7.4 mm, a focal length of the first lensis in a range of 5.0 to 6.7 mm, a focal length of the second length isin a range of −20 to −10 mm, a focal length of the third lens is in arange of 20 to 60 mm, a focal length of the fourth lens is in a rangeless than −15 mm, a focal length of the fifth lens is in a range ofgreater than 100 mm or less than −30 mm, a focal length of the sixthlens is in a range of 3.0 to 9.0 mm, and a focal length of the seventhlens is in a range of −5.6 to −2.2 mm. Further, an angle of view FOV ofthe imaging lens system is in a range of 78 to 88 degrees.

Table 14 illustrates conditional expression values of the imaging lenssystem according to the first example to the sixth example.

TABLE 14 Conditional First Second Third Fourth Fifth Sixth expressionExample Example Example Example Example Example f1/f 0.9581 0.96250.9709 0.9083 0.8973 0.9582 V1 − V2 36.85 36.85 36.85 36.84 36.84 37.67V1 − V3 0 0 0 −0.01 −0.01 −0.01 V1 − V4 35.75 35.75 35.75 35.74 32.5737.67 V1 − V5 18.74 18.74 18.74 18.73 18.73 18.73 f2/f −2.4147 −2.4392−2.4073 −2.2051 −2.1583 −2.4926 f3/f 4.4594 4.3697 5.9645 6.2369 6.15077.4219 f4/f −3.3851 −3.4081 −4.0742 −8.3378 −7.4963 −8.1920 f5/f −48.608−50.743 85.337 −10.699 −5.401 27.941 f6/f 0.7188 0.7252 0.7405 1.06800.9692 1.1706 f7/f −0.5644 −0.5653 −0.5709 −0.7094 −0.7013 −0.6953 TTL/f1.2306 1.2316 1.2182 1.1532 1.1532 1.1565 f1/f2 −0.3968 −0.3946 −0.4033−0.4119 −0.4158 −0.3844 f2/f3 −0.5415 −0.5582 −0.4036 −0.3536 −0.3509−0.3358 BFL/f 0.1902 0.1904 0.1812 0.1351 0.1353 0.1347 D12/f 0.03020.0304 0.0341 0.0267 0.0257 0.0296 SD5/IH 0.4935 0.4938 0.4824 0.51170.5101 0.4976 SD6/IH 0.7135 0.7135 0.6841 0.7116 0.6924 0.7157 SD7/IH0.9024 0.9131 0.8909 0.8433 0.8314 0.8523

As set forth above, according to the examples, performance of a compactcamera may be improved.

While this disclosure includes specific examples, it will be apparent toone of ordinary skill in the art that various changes in form anddetails may be made in these examples without departing from the spiritand scope of the claims and their equivalents. The examples describedherein are to be considered in a descriptive sense only, and not forpurposes of limitation. Descriptions of features or aspects in eachexample are to be considered as being applicable to similar features oraspects in other examples. Suitable results may be achieved if thedescribed techniques are performed to have a different order, and/or ifcomponents in a described system, architecture, device, or circuit arecombined in a different manner, and/or replaced or supplemented by othercomponents or their equivalents. Therefore, the scope of the disclosureis defined not by the detailed description, but by the claims and theirequivalents, and all variations within the scope of the claims and theirequivalents are to be construed as being included in the disclosure.

What is claimed is:
 1. An imaging lens system comprising: a first lens,a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens,and a seventh lens, sequentially disposed at intervals from an objectside of the imaging lens system, wherein 1.5<Nd5<1.6, 30<V5<50, andTTL/2IH<0.730, where Nd5 is a refractive index of the fifth lens, V5 isan Abbe number of the fifth lens, TTL is a distance from an object sidesurface of the first lens to an imaging plane, and 2IH is a diagonallength of the imaging plane.
 2. The imaging lens system of claim 1,wherein −10<V1−V3<10, where V1 is an Abbe number of the first lens andV3 is an Abbe number of the third lens.
 3. The imaging lens system ofclaim 1, wherein 25<V1−V4<45, where V1 is an Abbe number of the firstlens and V4 is an Abbe number of the fourth lens.
 4. The imaging lenssystem of claim 1, wherein 0<V1−V5<20, where V1 is an Abbe number of thefirst lens.
 5. The imaging lens system of claim 1, wherein a refractiveindex of the fourth lens is greater than 1.6.
 6. The imaging lens systemof claim 1, wherein 1.5<f3/f, where f is a focal length of the imaginglens system and f3 is a focal length of the third lens.
 7. The imaginglens system of claim 1, wherein the fourth lens has negative refractivepower.
 8. The imaging lens system of claim 1, wherein the fifth lens hasa convex shape on an object side surface.
 9. The imaging lens system ofclaim 1, wherein an F-number is 2.0 or less.
 10. An imaging lens systemcomprising: a first lens, a second lens, a third lens, a fourth lens, afifth lens, a sixth lens, and a seventh lens, sequentially disposed atintervals from an object side of the imaging lens system, wherein anobject side surface of the fourth lens or an object side surface of thefifth lens is concave, an F-number of the imaging lens system is 2.0 orless, and TTL/2IH<0.73, where TTL is a distance from an object sidesurface of the first lens to an imaging plane and 2IH is a diagonallength of the imaging plane.
 11. The imaging lens system of claim 10,wherein the third lens has positive refractive power.
 12. The imaginglens system of claim 10, wherein the fifth lens has a concave shape onan image side surface.
 13. The imaging lens system of claim 10, whereinthe seventh lens has a concave shape on an object side surface.
 14. Theimaging lens system of claim 10, wherein a refractive index of the fifthlens is greater than 1.5 and less than 1.6.
 15. The imaging lens systemof claim 10, wherein −10<V1−V3<10, where V1 is an Abbe number of thefirst lens and V3 is an Abbe number of the third lens.
 16. The imaginglens system of claim 15, wherein 0<V1−V5<20, where V5 is an Abbe numberof the fifth lens.
 17. The imaging lens system of claim 10, wherein arefractive power of the first lens is greater than a refractive power ofthe third lens, and a refractive power of the sixth lens is greater thanthe refractive power of the third lens.
 18. The imaging lens system ofclaim 10, wherein the first lens has positive refractive power, thesecond lens has negative refractive power, the third lens has positiverefractive power, the fourth lens has negative refractive power, thesixth lens has positive refractive power, and the seventh lens hasnegative refractive power.